Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b6310a399cb1ee…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 14:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91a92e37f947c05af23a42b67aaa1c0b SHA-1: 2492cd68be0a8668e58907983c87dcdede76ca67 SHA-256: 92b6310a399cb1ee3e603cf0c2c44770d6b7ad663bc4c9bad7742b9f480034bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to lure victims to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbac7132fd---maparedij.pdf In PDF document text
    • https://aldurra.ly/images-editeur/img/file/40022698262.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3835207181---kawebumasivad.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/25300655154.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/8eb5f5553fba15a976f66de19753e942/27413011872.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/73384200715.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/38989690708.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8f3a6ee9---969484753.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/43607549901.pdfIn PDF document text
    • http://haki.vn/uploads/files/fazopevapabirudet.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/vokode.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ce103f5e---xitufopepuro.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a2acb9cd9d9681072217e64854b5ff4d/kepepolezibopojelulepumud.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021042823284870.pdfIn PDF document text
    • http://klhl.com/userfiles/file/83683042660.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e842a2191b---70529017743.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f243e18155---sobabusega.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/def877ddd43be4145fe50d015a8b28c8/12275396010.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c87e7ff5980cef9cd865bf342e916660/taronebovufija.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/zumezerobulex.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad3dd8cfa7---22061007540.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/laganudivopovupidevum.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/jtqkns2ht6aojlb94tjl75j13j/2740693464.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/h0dcmu2l4vcda1mtgudh5s7eil/1774742319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=benadryl+and+anaphylaxisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 10540 bytes
SHA-256: ed648977e90ebddd08a145184628a9c49a7e4964ae33f9d8cb49fb888c435b66
font_02_sfnt_off00012633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12633 17424 bytes
SHA-256: 52acaa322f8621e75a2122ef57185ff41b10c1ba238eb3fd8e908f536b369bc5

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